30In particular, as regards the principle of proportionality, the Court has already held that, in accordance with that principle, the Member States must employ means which, whilst enabling them effectively to attain the objectives pursued by their domestic laws, cause the least possible detriment to the objectives and principles laid down by the relevant European Union legislation (see, in particular, Case C-84/09 X [2010] ECR I-11645, paragraph 36 and the case-law cited).
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